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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19be27350a33b82f3903e0a8da38e687cba9e6a9229c69e82b7e0dced40734ad' 
  AND token = 'IsJdbmGO6ABy1JJW1O7wpsOcTw4/Rh0fFBpg6mFHsjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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