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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb62b8d6ff58d9deb8b010fdb375958e2387d09dda07187be6b43489041bd99' 
  AND token = '2wfEvz5R4QKzwmp7T0skVQhI2zWqy2DKKHkDc8DoA5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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