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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f32820df41401926ef13de12994cc0d559d04f860295a2a161c61740bcff84c' 
  AND token = 'OHL2znQiH1EtaMdMVz8ZDvX3f//qCtll7n48YD2LyXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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