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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135411724476a7c5c17d1d982af1b510db024e7787f87bb14fa8c5ae744d0f72' 
  AND token = 'S/lA6uwdwOVaE02aJ3DbxdGJN/GKxS8yhr1/XvltYxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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