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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bcafc6cde01b8c8ef6d309118680fa647e5a62e412a0050c131db0996d11bf6' 
  AND token = 'bwbNUO7azKEpFmXLvN3uGji2Db6bDQeYTqPg2BAGhwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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