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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411bf512316012a89d9cd35ff540af315b5155bc57a5bb946b04da5c49d4b16a' 
  AND token = '1t6erUbkAcb76h+TLPLjHB8nAUY3HBq/5l558ic+YLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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