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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dda5dba96806468c966bd5d283274852917cfea7ca07f91746e71a298ebd4e3' 
  AND token = 'r9K6qyQduzJh4QTp2T4O/9d4qKINa2Vv8H+LP3bJD1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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