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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ea9b6d2a83bcc9d276aca3a24d6fa6a6c6af9dda84ef3dd3bf2f8c6a62c712' 
  AND token = '0/Zm9sBk3GP11cqYXUhcROq7eZERfZ6zUWtn3bNzupc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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