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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5dae603f6ea9192b9e2d8f6e1ead4a199d0807ea2d0216d98cd9432fd23092d' 
  AND token = 'mcBqKVzP+R794WzUnIYUFpc2WRr/xfH0eUSlf+U1s4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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