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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '151ec6a7cd519db4130e2b01fbb73bc6b7ae1b67b9ed7d5cb6e7b1e06bb4882b' 
  AND token = 'wDi7Va4VcoIuYAlSKoDJ6rhS8uJqtZWTwBZxH3s5V9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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