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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bb64becce2ad904676339560076b4a8c4709eaded21473c36b9c4d4980387b' 
  AND token = 'i8lEgNtfC6J4QgDVuqqJW4lKAEdB1v14tjnIK6u7oiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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