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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690383f53ff3672d82bee59f95090490ac069fca1fdcb04d84f39ce957be374f' 
  AND token = 'o7nz9wggXyQBROHqDkmKpS4WtjtlKXD5HOTWNIRZz7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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