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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a63da8de125b8b4169e70551a3ad65fbc1fd6b03bf29a3b4f179f4c5675345' 
  AND token = '8A24DbJ4bP8zas1HIcHi2wcn1jm5t+58eEHFESovsB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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