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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc39a989fb669c60fb39055da7ce07e5ef01d354e11b739f958cd27b42dafb48' 
  AND token = 'UYjyKHN6jF6odc1jYl2AeEp8uXg2taxpL2cM3MwUPI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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