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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8dbbcc3c651ef8d4284ae6a112e6426e18270b87fbb4902e5cb79c4c3ef6130' 
  AND token = '+ObpZB18uLvw2QkcEkTGwjdTlU5V6yfG5hkAkvozuDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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