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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d32739f786811803e6001572813eb9d8babb16d1a549d9c94efe8b53b89cf0' 
  AND token = '0P2wwH8J1H01EDDTE/V9GvFbPFfGUOc6jVju9tBeXP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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