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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d17edcbb25502bfde0633c72625d67aa26a3e04bf622aedd7965ec7e197b6f3' 
  AND token = 'B6147ryWCekktYwJlFWZcBjyxpqMNBq7/rvjouO7biE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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