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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e4570e24294e04721a8b7fe5688389e0448caaef322cbc0059be0b139c9585' 
  AND token = 'kriZKk1WVU5lDHwfi+6NYhVNqMt6b5lwfr9oZDd8rAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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