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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c922a407f566b8c4074750f42811a56bc1bb6f64a7abd83a0f11f386c955944' 
  AND token = 'RMWFrbMyfrwZR6B9sHQ856bNx7Td4rLb554h3RJ11P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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