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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd31e94f1f44dd96acadd96638f847fdc0c5a8cc9d1ff4cc56b92b7990b9b07f' 
  AND token = '2cweiq9MZUvi1QQjXZbK5vUXcRmBJpgABf60dnwhLTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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