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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4ae978f91f5f0ebc8c692882c24540b570276790f8746251ef6622860a9a38' 
  AND token = 'LdacpI+/gsNC6hNrXqxQyoCAwXsRNv7F4O90lo302BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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