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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f0e4a76610476ab0f630eabf3c0414d820364bb38615fdee6e9b8f87065c2e' 
  AND token = 'B0UYuOY9ResXYhj1FWp1shE0vLKJ2q6J4+/yumoh4io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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