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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc622456382db5068976c7a3f7c96b7a63ec952c950e42e84a21c6b5a549ce0' 
  AND token = 'N/kd4EXViGyo2jQEE9HaDi/IXM2TeVR0RLmqPYq58D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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