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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5f41f60f9ed7ff58561dcf91cbc2ebe3201060699a5884769e2efcbeff263b' 
  AND token = 'j3B9ESE1v6CMwCHxz6n3Oiab1xIOFF8aPpOLhfUt1dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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