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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36a9616a7b8390878442c3e0da7a62ae600c843fed499a7312baf7eb372fb92' 
  AND token = 'pkPhZFZBkrEApWoBkEgMKpUs6nMnNawIZj/sROukq8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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