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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8afb5efacb13ca83a7bf9d8403f004d4ed4d9208f8744b34c7983991ffd846' 
  AND token = 'DCdhic3B9jhnvjOTFzq6Wg59BL6Nj82uZPbhPA6G7cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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