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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773f7437b213f860dffe8371a01e4055b40d6ac63fbc4c42e4b9781c113924b7' 
  AND token = 'UR77B/UC6VHuhgJTwetDbFB1jh8IgoDwfok4dc/Yf9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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