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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025f0ae4ad9fc64c57879128ad5a511f54213a49f394585f4d6877f4805479d7' 
  AND token = 'yW3X3AAkOdpZ0tkqka5ulUWTsgWwUS8b400zabk2fXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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