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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837fde554a10fd76be1f49d91c57dcb533fc76ce84ed3aafc79ad0d022febaf8' 
  AND token = 'Wo97lFhYdqo15qzHPNGxiOgWNnbwyCydM1ePZ3fnVKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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