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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e672aa890de68fb6309534aedcc5c1fb13a930deb001f38840c1dcb6933f6b' 
  AND token = '6iOJfofRoX4qyK3FLc6V0hH7FkFSjiix6YmFjRO6nIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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