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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52da9875b981a9c1f5d4c7e1eb19283387a9eda9b89fe75372525d7443f5665e' 
  AND token = 'g/xhdgHpT6RlYS3SM5KhoMJzr5nvEsKIreTa7aKO4nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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