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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c42fcec1e63725c6a8bf2d42f03f3b90e39feb941c8cc7646ab3a323d3ef3cf' 
  AND token = 'EmQy5AM33T5ce8XrH5mPtn4/cZJXdyyJBx1B6EFCq8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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