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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ab6d1073409f93319a4f0709c54b7760cdacfa60f62becb18bcdd4f12f144a' 
  AND token = 'Wd+H7ajksC1am9f+BYFDKlRR4aGj4KVSMTsaGD8ksbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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