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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913cd2e8634b723cefcaa16c82687dd7d6b279b1e2c99eda07e3a30cd42e4a07' 
  AND token = 'eONen1LPYTjW9LdjHY9Xu0A2ieB3cxCNxHFzxgi8kIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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