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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbcc6ed38f6d89687570ad2e5524a6e0d7b1f3878170decb9615f07a117b0a5' 
  AND token = 'vHxWs7NHw2jaBvCiBsNzqVisCj3cdGHhL2BJWieFx7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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