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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847f1aef46ba618de4f1d9f708f375985c08c3a943b1d5b7a50b1140905f36c9' 
  AND token = 'GsXy1bmCv8B33FJDHeTtVPWPQjrLg2OTDU21bTM/F4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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