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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9c2cebbe4d6cf42474863820e55933c06fdfb6c5ab46b46c4ae5848bb646c2' 
  AND token = '72ECgqwRZp5a6BdJ1hB6Z6Sva4ZhgQTWkGP0vjSrjEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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