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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b642959e14a82ee66d14216c98f4bc43f7b2f59ea80a266b1c523645363e7e42' 
  AND token = 'mgYI+G5hEEhveEWQ1EgbHt39fdTUPnH1CruJP6FBOls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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