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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c62bfa20ef47cf045fba811962f12de80f3f531647e0ae5d85483c28cd53ea' 
  AND token = 'P3k96HaSH5dTDMVXGgPJrSseeeeasWlTT1pjN/gOB8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}