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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30953d1fe3773f5656ea3a7f5a3593722f8dd6ce5b7fb08333d92acf404dd891' 
  AND token = '4W1BYWDJ5tQj/22kRBLtzYtiW82qU3gnX22ZyG4QCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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