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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003cb06267e5a3d001f554d0894021e26588674a59597bfea56896b8863e80e8' 
  AND token = '9Kdnaey/OKpwcLsgdrGheIzn2XZyR9SobgwJXvcpttc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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