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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de37737cd22ce7ab9e37ce49e9eec87b99a301de7ffe3f408b5872dd2b13c2df' 
  AND token = 'luPQzYwZkq+A/7aHWT9WESAaxJ5GxUepROySMH99D70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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