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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e939e3b8925e0d09a740f5a9d4db47cdf5230fe937ef2ac621de584d911b1d5' 
  AND token = '5YrKfv1dxtJNHw2wGB5kkYWzkJ96ouRBSXgAAeDZOLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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