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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09724ed587ff5918eae128c130dd9a5b4d32e129735e0068a25ab0393c5e5eee' 
  AND token = 'kTVTJmHEBjWybTIPZsRjMX1b1wBRF+l2PO3F/zGSqiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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