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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3752e6196a9deef53f57a39d53aca97a977063c1440afec8d8557e9e52b28114' 
  AND token = 'FepC0fmWcUNzo3RyfkoDTlOlqGZc9pZCN9KQ6L+AXDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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