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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a96e61f542eab89b50cc111609a4291e29e989b6ee26d531ef37f30483d46f7' 
  AND token = 'ToHgtsWsIByWgeXHx0/VNrJ91ER1Adi2kbazCDwI6eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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