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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fb7dd535423e7b2899bb988b4081c2c8c4cc6a58ed094c09d7997dcaf4cf93' 
  AND token = 'Lmk0KfAgsJ7e39Q5H8BA7ZpfoLHIofSa1EOzsSvghSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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