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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c4fa0c127d8365af8283096b3cf01db888acffa1563f0264d1daa593865e4a' 
  AND token = 'yzw5oDPfKRA/CzqN+9WtErbiXILdOHDD9/VzMpoc9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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