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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03bcee8b72c4bea7926eb51d9723f9c9521b518d1cb79f5b865f1a603ed6546' 
  AND token = 'KMVl7ChmftpHMGhfeatIhUEMj3xB/jsLhaEaXf0pVpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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