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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ddf03cc81a9f63a8feabe957e9708e7f47f97736d631b29bd44190322fd243' 
  AND token = 'iURgiSX8B/3/quhq86bISvT+PyEqa2GYE8z2aT+TRiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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