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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3f9ce21131ad9168c29e7ddbc3cd47e205d7e50e71cea2bc98f984b6e4c7e4' 
  AND token = '2sH7cqGPSF7EjEchOFPjxWdX7tuwIGtn+ApA3A8ORdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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