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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0177d5878b3c4844d8a066809ab0b0668ec6d6724458dd26a0450c4d2b5b0b4c' 
  AND token = 'bP5T/TDTQZlix+V01UDlTi9f/Eo/8DELr+AFpKKPJLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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