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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d7348a3b5362ee3f92629b561559a190d8e9d60fea4cdbd3cc3d0a26e8509c' 
  AND token = 'YSm1tLORW+W1YCUrqR+dXHtLfwazWl6ksIkfxt1hHoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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