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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8764157696de49e106a6d0ff62739d5c5493fd1ab7bf10f2b1834693c61cc613' 
  AND token = 'b7dw84lCV8TD1cD9EYZZLRBMLd7muVey2XlzcnzupKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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