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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6324cd8d8875a3044600b6277faebd4d6671ae73ad341581b2d71b74c20b0406' 
  AND token = 'aZmZLWL8MpG4Hf2IBAczfGPoWP1xseVlv6z4Jg2qu3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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