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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40af3f537822466bb61dc9d5b847e3cdf246e930935e867983bc4b074f2f4124' 
  AND token = 'wcNajhjHGQFf0WIDasvG2GOHIi/GMtuW1vaHgdw1jOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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