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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6664c9633b91e50962dcadf6d79b3ae1b7f42a31d4fbf42d1e975f996a310cef' 
  AND token = 'GYKjnFLXL4VbF7AR9fFKamK7UCtW6eqQu+lwzALFvQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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