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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f15ba956b880bf90ee5dee5f0398ec7d815348d8eb26faaef31d4d531b1fd2' 
  AND token = 'Ht6GrpKaOt5SQGltB8ida5ehB2qiJBb+zYg5v64e0JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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