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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b67ff3efcae8d7818f7b31311db25531a338480dbd972532b1eb1f8c9a4a80' 
  AND token = 'taJF2Ffj04sfUWxCu//BlEWyqqz9+zFWM23OKVbmljA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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